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Ingredients:
1.5 lbs ground beef
2 large onions, thinly sliced
2 tablespoons unsalted butter
2 tablespoons olive oil
1/2 teaspoon salt
1/2 teaspoon black pepper
1 tablespoon Worcestershire sauce
1 teaspoon fresh thyme leaves
4 slices Gruyère cheese
4 brioche burger buns
1/4 cup beef broth
1/4 cup mayonnaise
1 tablespoon Dijon mustard
Fresh parsley for garnish (optional)
Directions:
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